Head And Neck Myology Flashcards
Masseter origin and insertion
O: zygomatic arch
I: lateral mandibular ramus
Temporalis origin and insertion
O: temporal lines
I: coronoid process behind zygomatic arch
Medial pterygoid origin and insertion
O: medial edge of lateral pterygoid plate
I: medial mandibular angle
Lateral pterygoid origin and insertion
O: lateral edge of lateral pterygoid plate
I: temperomandibular joint and mandible neck (upper ramus)
Masseter function
Elevation, protrusion, lateral deviation
Temporal function
Elevation, retraction, lateral deviation
Medial pterygoid function
Elevation, protrusion
Lateral pterygoid function
Protrusion
What are the 9 muscles of facial expression?
Frontalis Occipitalis Modiolus Orbicularis oris Buccinator Mentalis Platysma Zygomaticus major Zygomaticus minor
Buccinator origin and insertion
O: lateral surface of alveolar process of maxilla and mandible in molar regions
I: blends with orbicularis oris
Mentalis origin and insertion
O: incisive fossa of mandible
I: skin of chin
Platysma insertion and origin
O: fascia as far down as superior aspects of pectoralis major and deltoid
I: lower margin of mandible to angle, other muscles at the mouth corner such as Zygomaticus major and orbicularis oris
Zygomaticus major origin and insertion
O: upper lateral surface of zygomatic bone
I: skin of the angle of the mouth
Zygomaticus minor origin and insertion
O: lower lateral surface of Zygomatic bone
I: lateral upper lip medial to angle of mouth
What are the four muscles of mastication?
Masseter
Temporalis
Medial pterygoid
Lateral pterygoid
What are the four suprahyoid muscles
Digastric
Stylohyoid
Mylohyoid
Geniohyoid
Digastric muscle details
O: Anterior = Inner side of inferior border of mandible
Posterior = Temporal bone
I: Body of hyoid bone via an intermediate tendon
F: Elevates hyoid bone, reverse muscle action (RMA) Depresses mandible
Stylohyoid muscle details
O: Styloid process of temporal bone
I: Body of hyoid bone, posteriorly
F: Elevates hyoid bone and draws it posteriorly
This is a small muscle that lies between the anterior and posterior digastric bellies
Mylohyoid muscle details
O: Inner surface of mandible
I: Body of hyoid bone
F: Elevates hyoid bone and floor of mouth, depresses mandible
Very large muscle
Geniohyoid muscle details
O: Inner surface of mandible
I: Body of hyoid bone
F: Elevates hyoid bone, draws hyoid and tongue anteriorly and depresses mandible
What are the four infrahyoid mucles
Omohyoid
Sternohyoid
Sternothyroid
Thyrohyoid
Omohyoid muscle details
O: Superior border of scapula and superior transverse ligament
I: Body of hyoid bone
F: Depresses hyoid bone
Digastric with superior and inferior bodies
Sternohyoid muscle details
O: Medial end of clavicle and manubrium of sternum
I: Body of hyoid bone
F: Depresses hyoid bone
Sternothyroid muscle details
O: Manubrium of sternum
I: Thyroid cartilage of larynx
F: Depresses thyroid cartilage of larynx
Thyrohyoid
O: Thyroid cartilage of larynx
I: Greater horn of hyoid bone
F: Elevates thyroid cartilage RMA depresses hyoid bone
